6.0 No Start
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Been a busy day, just changed out the AC system on my car. But got around to making a chart with AE hope you can see it. I figured I would have to change the HPOP eventually. But I didn't want to tear into it needlessly. Thanks for all the help. I guess I will start on getting the HPOP out.
Fleet Owner
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with the ficm out of play (no spool valve action) the system is basically deadheaded so that explains him being able to attain Higher ICP in this senereo
the only difference being the FICM unplug vs plugged
The ficm is responsible for the ICP pressure difference when these two senereo are compared
I believe he is seeing the effects of a weak HPOP intensified by putting ficm in play
He cranks it ICP slowly build the PCM tries to fire injector spools for split second but ICP pressures fall at that moment due to low volume/low ICP from HPOP so PCM stops its attempt to fire the spools and it a vicious cycle repeated many times Holding ICP in this 500 range
the only difference being the FICM unplug vs plugged
The ficm is responsible for the ICP pressure difference when these two senereo are compared
I believe he is seeing the effects of a weak HPOP intensified by putting ficm in play
He cranks it ICP slowly build the PCM tries to fire injector spools for split second but ICP pressures fall at that moment due to low volume/low ICP from HPOP so PCM stops its attempt to fire the spools and it a vicious cycle repeated many times Holding ICP in this 500 range
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There seems to be something wrong in the correlation between your voltage and the ICP pressure reading. I would sure check the ICP accuracy again!
Ford Values
Voltage...PSI
0.2............0
0.4.........200
0.73.......400
0.9.........660
01.2.......800
1.4........1000
1.6........1200
1.9........1400
2.1........1600
2.3........1800
2.6.........2000
2.8.........2200
3............2400
3.3.........2600
3.5.........2800
3.8.........3000
5............4045
The affect you are observing of the FICM sure seems odd to me.
Benny - From what I read, the FICM ISN'T seeing the required pressure. He is only getting that when the FICM is NOT installed.
Edit - I guess you are saying it happens so fast (getting over 500 psig pressure) that he doesn't see the ICP get to 500, AND the engine doesn't fire because of no fuel? So are you thinking that his FICM is the cause?
Ford Values
Voltage...PSI
0.2............0
0.4.........200
0.73.......400
0.9.........660
01.2.......800
1.4........1000
1.6........1200
1.9........1400
2.1........1600
2.3........1800
2.6.........2000
2.8.........2200
3............2400
3.3.........2600
3.5.........2800
3.8.........3000
5............4045
The affect you are observing of the FICM sure seems odd to me.
Benny - From what I read, the FICM ISN'T seeing the required pressure. He is only getting that when the FICM is NOT installed.
Edit - I guess you are saying it happens so fast (getting over 500 psig pressure) that he doesn't see the ICP get to 500, AND the engine doesn't fire because of no fuel? So are you thinking that his FICM is the cause?
Fleet Owner
Joined: Nov 2003
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pressure would never get above 500 psi and IPR at 85 percent, ICP voltage climbed to 1.4VDC, before cranking was about .6VDC. IPR adapter came in and stripped everything back off and checked for leaks. No leaking can be heard, also had a gauge to check leak off, as I wasn't for sure that it was a small leak and could not hear it. Does anyone know how to check if the FICM is the issue or is it leaking injectors.
You say above that the "pressure would never get above 500 psig" and you say the voltage "climbed to 1.4 vdc". That is what threw me.
.7 volts and 400 psig is about right with regards to the sensor and the PCM value correlation. However 400 psig is NOT enough to start. 500 psig minimum is needed.
So you feel the ICP sensor voltage and reading correlate properly, that's good. Have you begun getting the HPOP changed.
Did you ever tell us if you have a late 04 or an early one? Sorry if I missed it earlier.
If it is a late 04, dummy plugs and standpipes would be wise ......
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It is a Late 04, much easier to work on. I did not start on the pump yet. I have been going through the wire harness as I am getting erratic ohm readings for the ICP wires. Seeing if it is chaffed somewhere. I did price everything for changing out all the seals for stand pipes and dummy plugs. Since I am going to change out the pump it is a small price to pay once I start tearing it down.
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So I chased down a few chaffed wires on the ICP circuit and changed out the connector and ICP. I am getting about 200 to 300 psi more now, so about 560 psi during crank. I swapped out the the new and old ICP and got about 100 psi difference between them, so I am assuming the chaffed wires accounted for the other 100 psi difference. So the ICP was a little worn out. still not starting. I have stripped everything down and have removed the turbo. Was planning on removing the turbo mount and the cover today. Another thing, mine is an early 2004, the build date is 10/03 so I assumed the motor was after 9/22/03, but when I got the turbo off, you can clearly see it is the old style pump cover. After I got the turbo off, I pulled the IPR and did another air test. No leak, with Auto-Enginuity I could monitor pressure on the ICP for leak down. So I believe it is a weak pump. Plan on stripping off the valve covers and update standpipes and dummy plugs. Thanks for your help.
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Finally got the truck back together. Changed HPOP, new standpipes and dummy plugs, new ICP and IPR. cranked it over without the FICM installed to prime the HPOP. Pressure is good on cranking gets up to 900 to 1200 psi. Installed the FICM and cranked and it busted off but dies instantly. I have tried several times and it continues to do the same thing. Checked the fuel bowl and it is filling up. ICP and IPR appear to be reading correctly to start. pressure builds and the IPR comes down to about 30 percent. I am getting FICM sync and my FICM voltage is about 47 to 48 VDC. I changed Oil before I tried to start the engine to make sure there was fresh oil going into the new pump. Any thoughts?
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Didn't get to update yesterday. I did get it to start but had no power. Didn't get any injector clatter at all. Pressure is building slowing on the High Pressure Oil side when first trying to start after sitting. But once i crank repeatedly it stays in the 900 psi range and up to 1200 psi before the IPR corrects and drops pressure. my Turbo Duty cycle was at 85 percent while cranking and even when I throttle up it only goes down to about 70 percent. That was yesterday. Today it won't start. after a few seconds of cranking it starts shuddering and sounds like it is turning over faster like it wants to start. RPM shows steady on AE, and FICM sync, IPC, IPR and FICM voltage show good. I did the bubble test yesterday and today, no bubbles while cranking. Checked all connections on the FICM and other sensors just in case something was not on all the way and vibrated loose after it started, no culprit found. could injector stiction cause it the shudder while starting?
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So today I watched some of Diesel Tech Ron's videos on no start. One had an issue similar to mine. So I unplugged the ICP sensor and it started right up. I replaced the ICP while changing the HPOP so not sure how it went bad but guess it was bad from the start. So tomorrow I will replace the ICP and see if it is really the sensor or possible wire chafed somewhere. Will update after I change it. Thanks for everyone's help. Too bad Ron's not around anymore.
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i changed the ICP back then. so i had two bad ones. i put in my old one last night and still had issues with it. ohm out the wires they seem good. getting the numbets shown in manual. but will see when i get the ICP. bought online since auto parts store wants 150 for it. so it will be a couple of days before i update.